Hindrance of heavy-ion fusion at extreme sub-barrier energies in open-shell colliding systems

Journal Article · Fri Apr 01 00:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.044613· OSTI ID:20696085

Jiang, C L; Rehm, K E; Esbensen, H; Janssens, R V.F.; Back, B B; Davids, C N; Greene, J P; Henderson, D J; Lister, C J; Pardo, R C; Pennington, T; Peterson, D; Seweryniak, D; Shumard, B; Sinha, S; Tang, X D; Tanihata, I; Zhu, S; Collon, P; Kurtz, S ^[1]

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1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The excitation function for the fusion-evaporation reaction {sup 64}Ni+{sup 100}Mo has been measured down to a cross section of {approx}5 nb. Extensive coupled-channels calculations have been performed, which cannot reproduce the steep falloff of the excitation function at extreme sub-barrier energies. Thus, this system exhibits a hindrance for fusion, a phenomenon that has been discovered only recently. In the S-factor representation introduced to quantify the hindrance, a maximum is observed at E{sub s}=120.6 MeV, which corresponds to 90% of the reference energy E{sub s}{sup ref}, a value expected from systematics of closed-shell systems. A systematic analysis of Ni-induced fusion reactions leading to compound nuclei with mass A=100-200 is presented in order to explore a possible dependence of fusion hindrance on nuclear structure.

• OSTI ID: 20696085
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 71, Issue 4; Other Information: DOI: 10.1103/PhysRevC.71.044613; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPOUND NUCLEI
COUPLED CHANNEL THEORY
EXCITATION FUNCTIONS
HEAVY ION FUSION REACTIONS
MEV RANGE
MOLYBDENUM 100 TARGET
NICKEL 64 REACTIONS
NUCLEAR STRUCTURE